Detachable cord sending-machine cut-in.



C. M. HOLMES.

DETACHABLE CORD SENDING MACHINE CUT-IN.

APPLICATION FILED AUG. I8, 1916.

Patented Jan. 8, M18.

fg A S Qi n@ Mr b WIT/VESSES yC11-IAiEJli-ES MORRIS HOLMES, OF.JACKSONVILLE,.#ELORIDA.

Da-Maarre CORD SENDirG-ivreGHINEQUT-IN- .Specification of Letters Patent.

Patented aan. s, 191s.

Application *filed nAugust 18, 1916. Serial No. 115,598.

To all whom t may concern:

Be it known that I, CHARLES M. IIoLMns,

'a citizen of the 'United States, and aresident of Jacksonville', in the county off Duval and State of Florida, have invented a new and Improved Detachable Cord Sending- Machine Cut-In, of which the following is a full, clear, and exact description.

This invention relates to telegraphy, and deals particularly with means for connecting a transmitting machine, such as a c"vibropleX, with the main line through the sending key. i

The invention has for its general objects to equip a transmitting machine with a novel connecting means, whereby messages can be transmitted over one or more circuits withoutthe use ofothermechanical means, such as switch board connections orrepeaters, this being accomplished by a split socket taking the place of the usual binding post, and a split plug adapted to be inserted in the socket and having its separate parts connected with the wires of a cord conductor that leads to the terminals of the sending key, and by the use of two of such sockets, plugs and cord conductors, a transmitting machine can be connected with main line circuits leading to different and remotely situated points, so that a message can be transmitted simultaneously in one operation to such points. These results can be accomplished without disturbing the normal ccndition of the two independent circuits.

vVith such objects in view, and others which will appear as the description proceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particularity in the following description and claims appended hereto.

In the accompanying drawing, which illustrates one embodiment of the invention and wherein similar characters of reference indicate corresponding parts in all the views,

Figure l is a plan view of a transmitting machine with the circuits shown diagrammatically;

Fig. 2 is a detail sectional view on the line 2-2, Fig. 1, with the split plug removed from the socket;

Fig. 3 is a modiied form of socket; and

Fig. 4C is a detail sectional view on the line 1f-4, Fig. 2.

ving to distant stations.

Referring tothe drawing, A designates a transmitter for telegraph ser-vice, the machine being of that type known as a vibroplex. Instead of the usual binding posts a split socket B is lemployed for connecting the transmitter with the main line, the socket being divided into two parts 1 and 2 forming the terminals of the transmitter.

The part 1 is grounded on the metallic base plate 3 of the transmitter, while the part 2 is insulated therefrom and 'connected with the contact make-and-break means of the transmitter. A plug C is adapted to be inserted in the socket B, this plug being dividedl longitudinally into two parts 4 and 5, which parts are separated from each other by a strip of insulation 6. rIhe metal parts aand 5.are mounted in a ring or bushing ofinsulation, and they are connected with the'conductors 8 and 9 of a iieXible cord 10. This cord 10 leads to a sending key S of a main line, and it may be connected with the terminals ot such key in any suitable manner. To connect the vibroplex with the sending key or disconnect it, it is merely necessary to insert or remove the plug into or from the socket B. In transmitting machines manufactured with the improvement, the parts of the socket are set into an opening 1l in the base plate 1, there being a fiber sleeve 12 inserted in the opening to lit around the socket-forming parts 1 and 2. For machines already in use, the socketforming parts la and 2a may be fastened to the base plate by bolts 13 and 14; which are inserted in the holes provided in the base plate 3a for the usual binding posts. This construction is shown in Fig. 3, and it will be observed that one of the socket parts is insulated from the base plate of the transmitting machine while the other is grounded thereon.

In Fig. 1 the transmitter is shown equipped with two terminal-forming split sockets B, and there are two plugs C and cords 10 leading to the sending keys S. These keys are connected with separate main lines or independent circuits c and c lead- For instance, if it is assumed that the transmitter A is at Jacksonville, Florida, the line c extends to a receiving station R at Tampa, Florida, and the circuit c leads to a receiving station R at Savannah, Georgia. By this arrangement the machine A becomes a double translcut-in means enables the transmitter to be easilyand quickly detached from the sending keys, whereby the latter can be used for the transmission of messages in the ordinary way. The plug and socket connectors in sure firm electrical connections between the transmitter and keys, and the connections `can be easily and quickly broken or made lwhenever desired.

From the foregoing description taken in connection withv the accompanying drawings, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the invention appertains and while Ihave .described the principle of operation, to-

gether with the apparatus which I now consider to be the best embodiment thereof, I

desire to have it understood that the apparatus shown is merely illustrative and that such changes may be made when' desired as fall Within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. The combination of a vibroplex transmitter, a main line in two sections extending in opposite directions from the transmitter, distance stations connected with the sections of the' line, sending means connected with the sections of the line independently of the vibroplex transmitter, a cord conductor adapted to be connected in circuit with each section of the main line, a two-contact plug connectedV with the wires of each cord conductor, and terminal sockets on the vibropleX transmitter for receiving said plugs.

2. The combination of a main line, a vibropleX transmitter', sending keys connected with the main line, a. switch for shunting each key, a cord conductor having its ywires connected in shunt with each switch, a twocontact plug connected with the wires of each cord conductor, and terminal sockets on the vibroplex transmitter for receiving the said plugs.

CHARLES MORRIS HOLMES.

Copies of lthis patent may be obtained for ve cents each, by addressing the Commissioner of Patients, Washington, D. C. 

